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* update NV12 docs and snippets add single-plane input information create single-plane cpp snippet menu fix update formatting for sphinx directives Co-Authored-By: Ilya Churaev <ilyachur@gmail.com> Co-Authored-By: Vladimir Paramuzov <vladimir.paramuzov@intel.com> * additional snippet fixes --------- Co-authored-by: Ilya Churaev <ilyachur@gmail.com> Co-authored-by: Vladimir Paramuzov <vladimir.paramuzov@intel.com>